March 2002
Intermediate to advanced
464 pages
8h 51m
English
book
Enterprise JavaBeans™ Component Architecture: Designing and Coding Enterprise Applications
by Gail Anderson, Paul Anderson
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4.5. Data Access Object Pattern
The Music EJB shown in this chapter accesses a database using the JDBC's SQL interface. It works fine with Cloudscape's reference implementation of SQL (provided by Sun's J2EE reference implementation) but what happens if we change databases? How would this affect our code? Unfortunately, porting the current version of the Music EJB to a different database is not as smooth as one would like. Specifically, changes may be necessary to the bean implementation class, MusicBean.java. Although we isolated database access to separate private methods in the Music EJB, the EJB code must still be recompiled and redeployed.
The Data Access Object (DAO) pattern introduces a deeper level of abstraction for any EJB that accesses ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.